When Kupp had his MCL condition that it wasn't wise to rush back:
The doctor said that the player with an MCL issue would wear a brace to avoid graver events, which Kupp did.

There was a probability, the doctor said, that racing back in to play could lead to an ACL.
And that's what happened.
In fact, it was a non-contact tear if my memory serves.

On that note, unless that MCL is truly a sprain and not a tear I'd be very careful about using Hendy.